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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d242117906b490f136fd23989d34f1ccaa3da43a5006ce3acf9b74edf884b8d' 
  AND token = 'Yqi4r9pdAYr+rBm22bQ/N1CjtjwpAmA+3NYqhjf2PCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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