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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec5d315a3e47936760d140cce6deaa8b8720867a16c512b07685bd4bc61c732' 
  AND token = 'OlNpGAWWctLfDEefHsI2sHYAvpRNrhP4mCdqbCJuh5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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