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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985860eee0ad27bff6c8b8d0998cbc14fc61c08e87b758167c493c7365d173bc' 
  AND token = '0myHt4t5cKluWm/RBdQFqOoMVTO/6DPT7U0WXpvP4ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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