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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d9ee41dde4e7139e0932aa5fd1d2a8af6e265b83d7cdd77a9da7b061db96db' 
  AND token = '2n2kq3exGtdvBuur0zcbB+Q3sW/x5Z33whBVwQz3jSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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