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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9d8391917ae0859a203c9b9a6a9ed9fd9ebb71b8f331eb30e2601066927c16' 
  AND token = 'chygK0qozMIuxXOJ7+NJsyiDsHV2EFzjXvHtXrQFnS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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