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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa0625d16bb6b0df60b0ab5abaa96a54692fc5f1cb12f0dd9d3b2536c69a6c7' 
  AND token = 'neio9/oKvMJ+LWm8Imbrsm6SJ9NGkxKVg0CuBMGkjBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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