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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be56dfb7c416c505f851a96de73d4b79efdb3d18d5184ad7b19e727eef6e29fe' 
  AND token = 's7lKkFdRJXju6CVC0BqJLYx1eTaVTcjQ0VS5XLkS14Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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