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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2635a6248b4567b124dea238fc358c6c57a03d01fb172c5bfa4ad5fbe07b7ff1' 
  AND token = 'im8QqoTSQtdlTbcx7CSQgm75k05fIUsozr393yJrl9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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