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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425db46592b3a73347619f8fa9f8d13f8d304ac0c877aed0dd605164f6a47724' 
  AND token = 'PUHhlet4mvbMtPgf6KQdIRxMYJ3PJ3UTRqCi8B6FWUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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