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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb0e3eb97f3e004f8e53f4702f81e3e321d40ebc696519bf13722ddeea83e23' 
  AND token = 'pAbtRXM4UT1mIfUt2ho+SsKSsRg4O/6S/Lkw8QafNYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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