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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e52c1881423ed55043ee9303a72fd075e482374b5a9e46bf01dae2713dc599' 
  AND token = '0fy647jMiUARERbmzwiFm/Bd8J6+3JIRGS4wK2/PyoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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