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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b011bc5ed0e21edcc5ddb639368607531e973541e8bfbae4f47532c9cd1a9e85' 
  AND token = 'c3yjUhP9TogvehMUzOEppx9czFnR+aBYFXUFGYIkusE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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