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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6aaf03f7e8d9e0b82a3f115957e5e5d1582c66af7a60e18485c0a5d9929e01' 
  AND token = '6NLEZFjVyrTUz2cdHykYbumbiYptjIeXjK5gsbagog0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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