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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5d57d3e4ebbc34933ddd558419040f1c11e134b497299fc631c990dac7b8f3' 
  AND token = '3+Gty26905jOtV0Gvo3k6OyLJTk2zWjTradJGUVz2XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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