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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2898079745ff7075929b9e40ed25dddebec7114c0263b830a8b9a4b0a2d58474' 
  AND token = 'K0QUKFP6yG89hA8gnilopWnXKapkTTQbgwifvKW1hG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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