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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dbef19d7ad4e6a4095903054482be22fbe64de40ab80be8d586e71e3fb2fd5' 
  AND token = 'zBdzx5WaHQTkbQXyBY5bUUVP7Onte8faYCr5+c6a46Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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