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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7e1277caf1cddd36aeed02cf4f7ee4d0556a26254f99016d1952a28d957263' 
  AND token = 'kwm33QHJIFe+km5hkfeHv/5dnQFugY2gYPemWcZ8734=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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