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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ed4d6e94386d7538e9a34e81ba3a043779a6173aebc8634c26f2198429579e' 
  AND token = 'cbwiRNevgp0mc6ULpKOw45nMFrxbhb/3fJlXkfjxw1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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