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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39648dc47a5777202a39ddb7223ffa6098e1a6b0636b264dcf928ec9de76420' 
  AND token = 'X4zNSFFb6XGwNUM5uSYZN7Hg5yUg9WkJj6hNSlH2WBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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