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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a61f4345dd1aed0a978c2ffd3c033efe66abad6a593ec036b29892851f315c' 
  AND token = 'RLPwDmc5CQUHuTB1Yp48XY36Z8gscBC7RS24YdreGPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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