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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd6f3178117416d4e2ba80fab6c5721db59b5bb0f5d540542d9d48accfe6e52' 
  AND token = 'Q0wmaeprBX8WNrxdttkJ8giRRuQ4SrJluS+tuQK4MS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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