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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32dc37d35542cbebb9854dba63d295e0a255f3d8583e4b64e958316849257e0' 
  AND token = 'nOWE5bS1rmB1uEi+D0j9P3BBn+eQ5/WOKTm6NzjCvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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