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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7caeeed1c362171eba8772b0be9756d1d168c766702f8aad4d811656fcd4442f' 
  AND token = 'zdR6yfQSHvMIcAZLu/rSeJuuldIn/+qs4y4B2MWcSDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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