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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869772a039f48d312888ba87aa9a17d4e3d370ff85edc88c41bd02d6f8e738ba' 
  AND token = 'tIvTCInYAuPaYy9qleabkAoo8aQnlcUdc4G8QUC4n7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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