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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aacc8d625fd1259403bb809e7a527bd2fa9edc53318fd1f9fb39e447da6febd7' 
  AND token = '0gRm9P3eLt6ZgPCyg3EU37UBaApIrTtie30Pd4tOWmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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