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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07df4745ef8942edb646a6779532213f4c3600470f1e35f951304ab7d4d983ec' 
  AND token = 'i5XiOXHuAwG9eS8rfXSsoB1FkeLJkKr0wlvD4D/jBg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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