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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d92d017a074de4ad7a3a6cd16965ad952e6e9ed189de944469bff408847afcd' 
  AND token = 'oYLC/7P9d9irYojX+84QySb2wFxQS2O3fSz6/DeX2SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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