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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700aeff7587dda2d1c3d0a6e6227aa72a83334445f59357501c52d506b33b106' 
  AND token = 'ORB79rzmBrLfMxmsHR+e+vPbrQ7naNVWw+Ndy9pyjnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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