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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3129a0a07a2e23852a9f1c9c4bf5363a56f4de94807c898d840e3fff4cb7a596' 
  AND token = 'XQO9tzjg0co97qQCBerZIxDypmavbw9POJQRQEQit9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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