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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f4968a1b0fbfb7719875741e4a521534fca6a95a1033eeee06ade8df755bf3' 
  AND token = '/VwRIujcIq9dIApjZCly08SdYfo+AUzk1GTEJQWcuUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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