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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1267b5e107bc699e54e86016ffa2f5ab13a2ebdea8f24677e28819d05c4be9' 
  AND token = '3OyMbIs+Fc9yKO5ah/beLcUFyeN8BUfGPRD7YRWFYoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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