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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace807d0cb02e152eaa0f4f6b0ebed0ca4a023c8430451254c09d93f16636698' 
  AND token = 'aWKdxH0OtWyjjc837p3KSW2AmJY2qZJToboFIs7ccCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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