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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ecfd465c69e2f8c3fd6ed9c5d6556f65f89c82cd693e10461a35c102a6bca8' 
  AND token = 'Dm5r2x2XgFfJ9i5Q9ORfeAf3a5N7JrRIuFcRkGOhPiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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