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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7a8c1c18e48af534dfdb941c6b003f32bf43ebe6c6d2773616263f4dbbfc65' 
  AND token = 'nXDcm0Xxh4wpolY0lA1HxNhELcswPBGN2wOM68j8rgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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