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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a5d3cf1080bb0202db49a935b512cf88ca8f5da29c3405b244a0ee7a22b7a6' 
  AND token = '7qzyUTXDb04IA8IR9TQCmZgfCA8H3XbKQOtnDzXVHU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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