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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610c65beb1cc6949d197f7b20ae6f8010cc0084d2276c1df67c30fa580c8ace4' 
  AND token = 'rZb9o3+0BdjPinF6BTxEVqYQA0hxZSPZQzJbuGCVheY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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