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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cbd042ec96c6a6327f13cea308e9fe503ac5fe6934d43343e1232f59596827' 
  AND token = 'n2T3FFvdkDDnzfpSk+0P9bUxtA+Rui6mtbfo4EGyUUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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