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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71815f1d9aceabd75967ab8cf79dcfb4931349fcea2b7e52b134845b5c470173' 
  AND token = '54MRgunT9wiXmk40x8ZpEBBt5CuqAQf3J9NG8xMpJzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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