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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdd4ffde60666414a8868927d3b2ed3f9d330b9223a22f102e7f7f7403ad0a2' 
  AND token = 'QnJTZu4t0BIYQm1+98vlsfy00w0UgsD//yUrwXzwQ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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