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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda78cbc7866bd300b4fc491cda396a70aa38923943901208d10bd894ee93a49' 
  AND token = '1LFT01VeoDzJx+JMXdBeqdYjUme7LhsoT7xVAyhXPPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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