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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6e752efcddc243899bd1c058c25c992bf50c1f66bd4f20b9bafc0817c9f634' 
  AND token = '8KGGqt+exZmPLtmLSWsVvWNQLSM/C3xM6BICZTRkN80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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