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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abbf769781c7a0c7e50c8aff7ca9edb4aca8759b8ade0e84e4cb92056b8ff60' 
  AND token = 'H1riI/Jefbs/RWpy6B3DZV/3m+/7Ikle5xjcdjfS1y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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