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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa9e1a1e0ad2aca0e0c044099fe4fcef93cea0e6aa4ea684eb536bee3c861bc' 
  AND token = 'lYjsJ8WrN9gmAmHQM/vAiWuRwMRukKUynvEUcyD1WGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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