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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756173f429f31dc8ef8ea6b8a0c8a63b10c5a828e3c22a74bff867e750625358' 
  AND token = 'Wt3jfST4/5nCgzWmehwEDe5wwJsGvcuYNUElpfaJ7Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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