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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f1810c75c7184c5d6ccb9fb1ebb74cf11a4ebf4c5bef8a788a4698f5b42e1f' 
  AND token = 'eL2ac/eRDZ6YBDI6efMv4XA7BQT0n5xHbZighNElqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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