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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03adfd2177cd63bce3053ce0df0fb13af0eb0d3477d1c7a6cfc43adac87b52f' 
  AND token = 'ZqRt3KCSZ3DouBN3f3jR3Gj4o7wjA93uiWIZn1ahV0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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