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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed90249fadfa6d6d6bd3822562708d42b667c127395bcee0fd9662dd11639ac' 
  AND token = '/5Fw3XVCUaAE26sRIMVpIH3VnSm+imSqrnFdK4yroqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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