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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2964865c9bc44aa16d5ef90881b50935874f19e7a3bedff59597a9c8aebeca' 
  AND token = 'wXH3LoO1GHUeb4rBGpZS/U11RFkNRZYHoIwWkDwyYqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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