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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cad9dc7afe5a558e8498397868a0725141c511d4d81adf7d31ff885a7f28a6d' 
  AND token = 'xpv+Yew9jajEnodZEgQUWslZlv4f7VhHUqEI6iFv8bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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