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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a974706a8959ec4dfdf807c0c5300945e163d35f9516f1f4f6f481341e0cc67' 
  AND token = 'Ni923Fyw9exqbH3Hz4NtHT6ERoXP2fSTFXkSqLNOt+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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