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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1baba56d3f4ea8cb27587f58a601a1964f6ac69096a900c4101c4343501f32' 
  AND token = '06Y+f0C9RxnuzrmGF+suR47EHMR8Y/sBhS47gxtwNhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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