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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903fd4166d56a7446edbb1039a27bf20d3594da3bd4f7f74de1ba1e40921ce05' 
  AND token = 'iLOuxP8sc4IYdzYM0fE4qUBhcZcj2+uudpvPkFUpuOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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