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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94b790efc9d57e0ce61ae2a448c324ff9b652653cb5581cc87a177c28f7cf2a' 
  AND token = '4IYvlpdseISYhmmP7osZ0iEUE3TUsrggxWMPDSKbP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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