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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee771075fcfb593bcc4bb73c2ea0a6a24e3e15a68dc1afc35845a449d496d13' 
  AND token = 'ur5C1w3ht94bX6ilZtWKPEUJmIWk8KhgrRMnT2t9/LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}