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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f78a5aa9d34c1f747a3cb746350e79fb3445606cbcaba40c2f4a1cfc480b928' 
  AND token = '3AlVNoUcz/2+bfFS+T4jzHzU0EWp9rxM7oS9u+acYw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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