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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fc24cc1f4aef8c2e63fc3acbc05489915c46230a83870e193db7a48615ddb1' 
  AND token = 'wMt5z2Y0wSJZORV5d6Klk5lGy17yYyRtEYAFNpK92cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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