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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4cf18abc647d03e4a79a1e9e9e070b4f59bf8d91426e96f01c5b5ad4f8ee9f' 
  AND token = 'oMZtgjDEjTaebnQA69NAGOslcXItZ+2nJ0MZhLxrLxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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