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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bc3fce647d31171869fe751ea1faf0f607d5e605b3721a1c606810048169f4' 
  AND token = 'KhgS33jvQWiE5v6ZIm2uta89mYJHajKudrkHaUgflb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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