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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3904db688f0fa36c399ed9b0c2b55aec704215c82238430c8e1f8291daa5fb9f' 
  AND token = 'CJGcQKnC1eYBUSZ5u1WDoAYf90pR0HQJ962Mk74wHts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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