SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161306869bcd8eac9637757aed57cde668c64f17628e61f7f8d9babb7a8343b5' 
  AND token = '8pBu4ZRq0q1ipv2/MixBGLHSDRkgmq6U9owz26EqyVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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