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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f214524b669bb6beeac3293ca8bcaea0cdeff1aa60acb09e47548af4ca16d440' 
  AND token = 'Lz0JzzbGEcJyNPAEetGfVL0qOBL+xbj2xgPcR+h15UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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