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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e927009dcdfd26ab42cc1b0df73cb979932feccbad566f99245b55c1f7e51ae' 
  AND token = 'aeb0/FyEPxMd+kqD+zg3DwRP7hNIeDMlldJhnI+5+mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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