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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f83854602be036e6affcd03c90f7d4ef71b95781761c56fdf5009e1411a5560' 
  AND token = 'OWjmYJyGJOgRvr5FV4L6AED7sget1TodZY0zXl64xmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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