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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5691d7346601819294c357b5182cbb0d2738d277d7c73641d1dc19e94bb9acf' 
  AND token = '++e17uu+0rhu/V4C79R0Xm4XNNJUoJ94sJYsB3rCeng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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