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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a691fb0d27bb8e1c78dea40c7112c4b22581a5a8c5719f07201414985a740517' 
  AND token = 'Ma3MVWYA7iMVlZ7QNJaj+I7QkhzIdRFWLSpOrDVN++Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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